[PATCH 1/2] Handle DW_OP_GNU_implicit_pointer in dwarf assembler

[Yao Qi <qiyaoltc@gmail.com>]

DW_OP_GNU_implicit_pointer refers to a DIE with an offset of different
sizes in different dwarf versions.  In v2, the size is the pointer size,
while in v3 and above, it is the ref_addr size.  This patch fixes
dwarf assembler to emit the correct size of offset.  We've already fixed
this size issue in gdb,
https://sourceware.org/ml/gdb-patches/2011-09/msg00451.html

gdb/testsuite:

2017-01-24  Yao Qi  <yao.qi@linaro.org>

	* lib/dwarf.exp (Dwarf::_location): Handle
	DW_OP_GNU_implicit_pointer with proper size.
---
 gdb/testsuite/lib/dwarf.exp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/lib/dwarf.exp b/gdb/testsuite/lib/dwarf.exp
index f7e4236..1883c86 100644
--- a/gdb/testsuite/lib/dwarf.exp
+++ b/gdb/testsuite/lib/dwarf.exp
@@ -845,6 +845,7 @@ namespace eval Dwarf {
     proc _location {body} {
 	variable _constants
 	variable _cu_label
+	variable _cu_version
 	variable _cu_addr_size
 	variable _cu_offset_size
 
@@ -918,7 +919,11 @@ namespace eval Dwarf {
 
 		    # Here label is a section offset.
 		    set label [lindex $line 1]
-		    _op .${_cu_offset_size}byte $label
+		    if { $_cu_version == 2 } {
+			_op .${_cu_addr_size}byte $label
+		    } else {
+			_op .${_cu_offset_size}byte $label
+		    }
 		    _op .sleb128 [lindex $line 2]
 		}
 
-- 
1.9.1